/*
 * 面板谜题样式
 *
 * 版面沿用迷宫那套（heading / layout / side / legend），配色跟着本站主题变量走，
 * 明暗两套主题都能用。
 *
 * 两条这个仓库的硬规矩：
 *   1. 最外层容器不画边框（靠底色分层），里面的小东西照旧画。
 *   2. 格子（canvas）里的颜色一律走 CSS 变量：canvas 不能直接吃 CSS，
 *      界面上色时用 getComputedStyle 读这里的 --panel-*，所以**颜色只写在这一个地方**。
 */

.panel-workspace {
  /* 面板本体。
     底色对着黑方块量过：原来跟黑方块只差 10 点亮度，暗色主题下几乎糊在一起，
     所以往上提了一档（现在差 25 左右），格线仍然比底色亮得多。 */
  --panel-face: color-mix(in srgb, var(--surface-2) 94%, var(--text));
  --panel-grid: color-mix(in srgb, var(--text) 26%, var(--line));
  --panel-line: var(--text);
  --panel-glow: var(--accent);
  --panel-start: color-mix(in srgb, var(--text) 88%, var(--accent));
  --panel-symbol-black: #12141c;
  --panel-symbol-black-edge: color-mix(in srgb, #12141c 70%, var(--muted));
  --panel-symbol-white: #f2f4ff;
  --panel-symbol-white-edge: color-mix(in srgb, #f2f4ff 70%, var(--muted));
  --panel-bad: #f5aaa0;
  --panel-preview: color-mix(in srgb, var(--text) 34%, transparent);

  overflow: hidden;
  border-radius: 18px;
  background: var(--surface);
}

.panel-error {
  margin-bottom: 16px;
  border: 1px solid #f5aaa0;
  border-radius: 12px;
  padding: 14px 16px;
  background: color-mix(in srgb, #f5aaa0 14%, var(--surface));
  color: #f5aaa0;
  font-size: 13px;
  line-height: 1.6;
}

/* ---------- 标签条 ---------- */

.panel-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
}

.panel-tab {
  border: 1px solid transparent;
  border-radius: 9px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  padding: 9px 16px;
  font-size: 14px;
  font-weight: 750;
}

.panel-tab:hover:not(:disabled) {
  background: var(--surface-2);
  color: var(--text);
}

.panel-tab[aria-selected="true"] {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
  background: color-mix(in srgb, var(--accent) 14%, var(--surface-2));
  color: var(--text);
}

.panel-tab:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

/* 纸笔页解锁了但还没交：右上角点一下 */
.panel-tab[data-badge="on"]::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-left: 7px;
  border-radius: 50%;
  background: var(--accent);
  vertical-align: middle;
}

/* ---------- 头部 ---------- */

.panel-heading {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 18px;
  border-bottom: 1px solid var(--line);
}

.panel-heading h2 {
  margin: 4px 0 0;
  font-size: 1.12rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.panel-heading .eyebrow {
  display: block;
}

.panel-status {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.panel-status[data-kind="active"] {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
  color: var(--accent);
}

.panel-status[data-kind="complete"] {
  border-color: color-mix(in srgb, var(--accent) 60%, var(--line));
  background: color-mix(in srgb, var(--accent) 16%, var(--surface-2));
  color: var(--text);
}

.panel-status[data-kind="reject"] {
  border-color: #f5aaa0;
  color: #f5aaa0;
}

.panel-status[data-kind="error"] {
  border-color: #f5aaa0;
  color: #f5aaa0;
}

.panel-status[data-kind="locked"] {
  opacity: 0.7;
}

/* ---------- 版面 ---------- */

.panel-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 280px);
}

.panel-stage {
  display: grid;
  place-items: center;
  gap: 14px;
  padding: clamp(16px, 3.5vw, 30px) 18px 18px;
}

.panel-frame {
  display: grid;
  place-items: center;
  width: 100%;
}

.panel-board {
  display: block;
  max-width: 100%;
  border-radius: 14px;
  outline: none;
  cursor: crosshair;
  /* 手机上拖线不要顺带把页面滚走 */
  touch-action: none;
}

.panel-board:focus-visible {
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 70%, transparent);
}

.panel-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.panel-controls .button {
  padding: 7px 13px;
  font-size: 13px;
}

.panel-hint {
  color: var(--muted);
  font-size: 12px;
}

/* ---------- 右边那块 ---------- */

.panel-side {
  border-left: 1px solid var(--line);
  padding: 18px;
  background: color-mix(in srgb, var(--surface-2) 45%, var(--surface));
}

.panel-side h2 {
  margin: 4px 0 14px;
  font-size: 0.98rem;
}

.panel-kicker {
  color: var(--accent);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.2em;
}

.panel-count {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  background: var(--surface);
  color: var(--muted);
  font-size: 12px;
}

.panel-count strong {
  color: var(--text);
  font-size: 15px;
}

.panel-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(42px, 1fr));
  gap: 6px;
  margin: 12px 0;
  padding: 0;
  list-style: none;
}

.panel-list button {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  padding: 8px 0;
  font-size: 13px;
  font-weight: 700;
}

.panel-list button:hover:not(:disabled) {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
  color: var(--text);
}

.panel-list button[aria-current="true"] {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
  background: color-mix(in srgb, var(--accent) 14%, var(--surface));
  color: var(--text);
}

.panel-list button[data-solved="true"] {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
  color: var(--accent);
}

.panel-list button:disabled {
  cursor: not-allowed;
  opacity: 0.4;
}

.panel-side > .button {
  width: 100%;
  padding: 8px 12px;
  font-size: 13px;
}

.panel-legend {
  display: grid;
  gap: 7px;
  margin-top: 16px;
  color: var(--muted);
  font-size: 12px;
}

.panel-legend span {
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-legend i {
  flex: 0 0 auto;
  display: block;
  width: 18px;
  height: 18px;
}

.panel-legend-start {
  border: 3px solid var(--panel-start);
  border-radius: 50%;
}

.panel-legend-end {
  border: 3px solid var(--panel-start);
  border-radius: 9px;
  width: 22px !important;
  height: 13px !important;
  align-self: center;
}

.panel-legend-square {
  border: 1px solid var(--panel-symbol-white-edge);
  border-radius: 4px;
  background: linear-gradient(135deg, var(--panel-symbol-black) 50%, var(--panel-symbol-white) 50%);
}

.panel-legend-gap {
  position: relative;
}

.panel-legend-gap::before,
.panel-legend-gap::after {
  content: "";
  position: absolute;
  top: 8px;
  width: 7px;
  height: 2px;
  background: var(--panel-grid);
}

.panel-legend-gap::before { left: 0; }
.panel-legend-gap::after { right: 0; }

.panel-finale {
  margin: 16px 0 0;
  border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--line));
  border-radius: 12px;
  padding: 10px 12px;
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
  color: var(--text);
  font-size: 13px;
}

/* ---------- 格纸页 ---------- */

.panel-paper-body {
  padding: 16px 18px 20px;
}

.panel-paper-note {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 13px;
}

.panel-quiz {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.panel-quiz-item {
  display: grid;
  gap: 10px;
  justify-items: center;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
  background: var(--surface-2);
}

.panel-quiz-item[data-state="right"] {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
}

.panel-quiz-item[data-state="wrong"] {
  border-color: var(--panel-bad);
}

.panel-quiz-picks {
  display: flex;
  gap: 8px;
}

.panel-tick {
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  padding: 7px 13px;
  font-size: 13px;
  font-weight: 700;
}

.panel-tick[aria-pressed="true"] {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
  background: color-mix(in srgb, var(--accent) 16%, var(--surface));
  color: var(--text);
}

.panel-quiz-mark {
  min-height: 16px;
  color: var(--muted);
  font-size: 12px;
}

.panel-quiz-item[data-state="right"] .panel-quiz-mark { color: var(--accent); }
.panel-quiz-item[data-state="wrong"] .panel-quiz-mark { color: var(--panel-bad); }

.panel-exercise {
  display: grid;
  gap: 12px;
  justify-items: center;
  margin-top: 18px;
  border: 1px dashed var(--line);
  border-radius: 14px;
  padding: 14px;
}

.panel-exercise-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  width: 100%;
  color: var(--muted);
  font-size: 12px;
}

.panel-exercise-head strong {
  color: var(--text);
  font-size: 13px;
}

.panel-paper-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
}

.panel-paper-foot .button {
  padding: 9px 18px;
}

#panelPaperResult {
  color: var(--muted);
  font-size: 13px;
}

/* ---------- 窄屏 ---------- */

@media (max-width: 820px) {
  .panel-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .panel-side {
    border-top: 1px solid var(--line);
    border-left: 0;
  }
}